Hot Gas Bypass Screen - York YK-EP Operation And Maintenance Manual

Hot gas bypass screen

Figure 19: Hot gas bypass screen
This screen displays a cutaway view of the Hot Gas Bypass Valve. The setpoints relating to the
Hot Gas Bypass Control are maintained on this screen. Related Hot Gas control parameters are
displayed for reference. The Hot Gas Valve can be manually controlled from this screen. Through
animation, the relative valve position is displayed. The parameters displayed on this screen vary
according to the software version and the selection made for the Motor Communications Protocol
Setpoint when equipped with Variable Speed Drive (VSD) or Medium Voltage Variable Speed Drive
(MVVSD).
Table 43: Display only
Field/LED name
Valve Position
Pre-Rotation Vanes Position
Delta P/P
Temperature Differential
(LCHLT – Setpoint)
YK-EP Style B Centrifugal Chiller
Description
Displays the present position of the Hot Gas Valve as a value
between 0% (closed) to 100% (full open). By animation, the valve is
shown in its relative position. The actual position of the valve does
not match the percentage displayed in the Valve Position Box. The
actual levels and their relative values can be read from Table 44.
Displays the present Pre-Rotation Vanes position as a value between
0% (closed) and 100% (full open).
Displays the chiller head pressure calculated as (condenser pressure
– evaporator pressure/evaporator pressure).
Displays the difference between the Leaving Chilled Liquid
Temperature and the Leaving Chilled Liquid Temperature Setpoint.
57